Table 2. Intraoperative parathyroid hormone monitoring and pathology.

Variables		TPHPT (n = 158)	NPHPT (n = 122)	P value
IOPTH change (%)a		76.6 ± 19.2	72.5 ± 22.2	0.104
Miami criterion met		143 (91.1%)	107 (87.7%)	0.430
No. of lesion				0.004b
	1	151 (95.6%)	109 (89.3%)
	2	4 (2.5%)	13 (10.7%)
	3	3 (1.9%)	0 (0)
Parathyroid size, cm
	Single lesion	1.5 ± 0.7	1.4 ± 0.8	0.118
	Multiple lesions	1.1 ± 0.6	0.74 ± 0.4	0.011b

All continuous variables expressed as mean ± standard deviation.

TPHPT = typical primary hyperparathyroidism, NPHPT = normocalcemic primary hyperparathyroidism, IOPTH = intraoperative PTH monitoring.

Miami criterion; IOPTH drop ≥ 50% from the highest of either pre-incision or pre-excision level at 10 minutes after gland excision.

^a% change from baseline; ^bStatistical significance.